I have one or two of the old IceCap ballasts and a wiring harness with endcaps set up for running two VHO tubes. Just no bulbs. Given that these bulbs seem to be impossible to find now... How can I retrofit this for modern (i.e. I guess that means T5) use? Can I just swap out the endcaps with T5 endcaps and call it a day? Or is it more complicated than that?